XCR: Inconsistent Ejection

QYV

QYV

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I had my XCR out for the first time recently after finishing break in and I am now getting inconsistent ejection. Most cases will go 10+ feet @ 2 o'clock, but about 20% will just barely come out of the ejection port and land right beside me. I had no malfunctions, but it did happen once on the last round in the mag and the case was only half-way out of the ejection port. As per the manual I turned the gas setting down from 4 to 2 after break in, and I also gave it a quick clean and light re-lube (CLP). My first thought was that the gas setting was to low, but after I opened the gun up and there looks like a lot of wear for only 420 rounds (55grn winchester). There are some wear marks on the top of the op-rod and the driving bands on the bolt are polished bare metal where they contact the receiver. There is also some strange wear inside the receiver above the ejection port right in front of the ejector.

XCR%20009s.jpg

XCR%20008s.jpg


So now I'm thinking that its insufficient lube that is causing the inconsistent ejection, is that possible?
 
PaveHammer said:
Anaemic ammunition?

This is the first I've heard about ejection and wear problems on the XCR.
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It was consistently flinging the cases a good 30 feet on gas setting 4 during break in, but it also had quite a bit of CLP in there. I am really leaning towards me not putting in enough lube as the root cause of the ejection and wear, but I don't know if inconsistent ejection force is a symptom of insufficient lube.
 
QYV said:
I had my XCR out for the first time recently after finishing break in and I am now getting inconsistent ejection.

I turned the gas setting down from 4 to 2 after break in
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It worked perfectly at 4? Go back to 4... does it work perfect again?
Need to confirm that before moving on.
 
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G37 said:
It worked perfectly at 4? Go back to 4... does it work perfect again?
Need to confirm that before moving on.
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Ya, this was my first thought as well, but setting 4 was actually sending the brass TO far, as it should seeing as it is the highest setting. I was thinking of sticking it on 3 but to me it seems like treating the symptoms and not the disease. Would insufficient gas cause the disparity I am seeing in ejection? The difference between 10+ feet and half-out of the ejection port is quite a bit!

I know that what really needs to be done is to get the damn thing lubed better and take it out again. How much CLP should I be using for lube?
 
I would recommend forwarding the information directly to Robinson Arms itself. I am sure they would provide the correct answer to what normal wear isalong with the ejection problems. They built it, they designed it, they should know the guns quirks .
 
soldier506 said:
I would recommend forwarding the information directly to Robinson Arms itself. I am sure they would provide the correct answer to what normal wear isalong with the ejection problems. They built it, they designed it, they should know the guns quirks .
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I have posted this also in the Rob Arm industry forum at arf.com, which Alex frequents.
 
QYV said:
Would insufficient gas cause the disparity I am seeing in ejection?
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Its a primary consideration in any gas fed system!!!

Go back to the manufacturer and describe the symptoms and point out the gas setting and see what they say - also be sure they know the ammo you're using - it may be an issue, or it may help them connect the dots if others like yourself having been seeking their advice on the matter. The XCR is a new platform (relatively speaking) so kinks are still unidentified as are the solutions... thats the ##### about being a first adopter of anything... the monkey in us that likes shiny new stuff loves it but sometimes the practical side of it bites you in the ass...

For the record, I want an XCR so I am not dissing the platform...
 
QYV said:
Ya, this was my first thought as well, but setting 4 was actually sending the brass TO far, as it should seeing as it is the highest setting. I was thinking of sticking it on 3 but to me it seems like treating the symptoms and not the disease. Would insufficient gas cause the disparity I am seeing in ejection? The difference between 10+ feet and half-out of the ejection port is quite a bit!

I know that what really needs to be done is to get the damn thing lubed better and take it out again. How much CLP should I be using for lube?
Click to expand...
Waht I'm reading is:
"We probably found the problem but I don't want it to be that simple." :rolleyes:
 
QYV said:
I know that what really needs to be done is to get the damn thing lubed better and take it out again. How much CLP should I be using for lube?
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I have no experience with the XCR, but is there any reason you are not using a grease?
That looks like odd wear, even if it was lightly lubed with an oil.
 
sgt_scarecrow said:
Its a primary consideration in any gas fed system!!!

Go back to the manufacturer and describe the symptoms and point out the gas setting and see what they say - also be sure they know the ammo you're using - it may be an issue, or it may help them connect the dots if others like yourself having been seeking their advice on the matter. The XCR is a new platform (relatively speaking) so kinks are still unidentified as are the solutions... thats the ##### about being a first adopter of anything... the monkey in us that likes shiny new stuff loves it but sometimes the practical side of it bites you in the ass...

For the record, I want an XCR so I am not dissing the platform...
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I still love mine. Despite the funny wear/weird ejection the gun still ran, I had absolutely no failures.
 
Armedsask said:
Waht I'm reading is:
"We probably found the problem but I don't want it to be that simple." :rolleyes:
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Shhhhhhuddup! :p

Yes I will try upping the gas setting if the re-lube doesn't work. Looking back, the guts were pretty damn dry and I *think* it only stared the weak ejection at the end of my session. So I guess I gotta go shootin' again real soon... damn ;)
 
beltfed said:
I have no experience with the XCR, but is there any reason you are not using a grease?
That looks like odd wear, even if it was lightly lubed with an oil.
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I figured since CLP is used so much in AR's, and the XCR construction-wise is very similar to an AR, it was the natural choice. Does anyone know of a reason NOT to use a grease in the XCR?
 
QYV said:
I figured since CLP is used so much in AR's, and the XCR construction-wise is very similar to an AR, it was the natural choice. Does anyone know of a reason NOT to use a grease in the XCR?
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I grease the buffer and buffer spring in my ARs, but keep to an oil in front of those (CLP, Miltech or the like) Keep in mind the AR blows gas and carbon back into the action, making grease on the bolt not the best lubricating solution, although I have used grease sparingly to no ill effect other than an abnormally messy clean up.
The other semi autos in my posession (Garand, M14, VZ 52/57, & PE-90) get grease in the action.

Grease is generally better at staying on the bearing surfaces, but will attract and retain grit and crap as well.
Oil on the other hand tends to flow away from the bearing surfaces over time and use, but the trade off is that it takes that grit and crap with it.
Oil is great for extended field or dirty use, but grease may provide better protection for range use.
 
QYV said:
Shhhhhhuddup! :p

Yes I will try upping the gas setting if the re-lube doesn't work. Looking back, the guts were pretty damn dry and I *think* it only stared the weak ejection at the end of my session. So I guess I gotta go shootin' again real soon... damn ;)
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It should be able to run dry. I still say that it is your gas setting. Turn it up.


You are hearing hoof beats in Saskatchewan and assuming it is a zebra.
 
Armedsask said:
It should be able to run dry. I still say that it is your gas setting. Turn it up.


You are hearing hoof beats in Saskatchewan and assuming it is a zebra.
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It was running dry, no malfunctions remember! Ya, it will probably run *better* dry on setting 3, but if it will run good on 2 while lubed then why not?
 
qyv- I remember reading that gas setting one was for suppressors, setting two was for full power NATO spec'd loads, setting three and four were for your basic 55gr WWB/american eagle/wolf stuff. I haven;t tried my xcr on setting two yet, but I am betting it will do the same thing.

Setting four is powerful. the brass came out so hard and fast that I have many large cracks in my windshield. cheers.
 
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